313 レーザピーニングによる構造材料の疲労強度向上(塑性加工)

概要

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The authors have applied laser peening to an austenitic stainless steel SUS304 and a cast aluminum alloy AC4CH to investigate the effect on the high-cycle fatigue properties. Rotating-bending fatigue testing was performed for samples with and without laser peening. The results showed that the fatigue life of laser-peened material was significantly prolonged compared to unpeened material. Replication technique and micro tomography (μCT) with highly brilliant X-ray of SPring-8 were applied to precisely evaluate the effect prohibiting pre-crack from propagating in laser-peened material. The three dimensional (3D) image of fatigue cracks was clearly reconstructed by micro tomographic technique with a phase contrast effect of coherent X-ray of SPring-8.
社団法人日本機械学会の論文
2006-11-25